Transmitter for wireless communication.



W. HARRISON.

TRANSMITTER FOR WIRELESS COMMUNICATION.

APPLICATION EILEE 1,511.27, 1903. RENEWED 001'. 14. 1914.

1,1 1 9,952. Patented Dec. 8, 1914.

WITNESSES. INVENTOH UNITED STATES PATENT OFFICE.

WALTON HARRISON, 0F NEW YORK, N. Y.

TRANSMITTER FOR WIRELESS COMMUNICATION.

Specification of Letters Patent.

Application filed January 27, 1903, Serial No. 140.693. Renewed October 14, 1914. SerialNo. 866,729.

To all whom it may concern Be it known that I, WALTON HARRISON, a citizen of the United States of Alnerica, and residing at Brooklyn, city of New York, and State of New York, have invented certain new and useful Improvements in Transmitters for Wireless Communication, of which the following is a specification.

My invention relates to wireless communication, my more particular object being to produce an effective transmitting apparatus. To this end I connect together, at the sending station, a number of separate oscillators and suitable antennae, so arranged that there is an unobstructed path from each antenna to the receiving station, and that the several oscillators, under control of a single key or analogous transmitting device, all contribute to throw off wave energy, so that the total sum of the energy transmitted multiplied as compared with the wave energy which could be transmitted by a single oscillator. Inthisco'nnection I call attention to the fact thatin transmitting systemsheretofore used, great difliculties have been encountered. in the effort to increase the Wave energy by increasing the number of oscillators or the number of antennae. While. such efforts have been partially successful, the increase in wave energy has been disproportionately less than that of an arithmetical ratio. What I seek more particularly to do is to enable the power employed at the transmitting station to be increasedl with a proportionate increase in the effective wave energy radiated, so as to attain longer distances of transmission. This I do in two distinct ways (1) by adding together the work done by a large number of separate oscillators,and (2) by spacing the antennae far enough apart to prevent the currents in one antenna from interfering materially with the work of the other antennae, yet all being controllable, as a unit, from a single source.

Reference is made to the accompanying drawing forming a part of this specification, and in which like letters indicate like parts.

Figure 1 is a diagrammatic elevation, showing both the transmitter and receiver, together with an ideal representation of several electro-magnetic Wave trains; Fig. 2 is a diagrammatic plan of the transmitter and receiver, together with an ideal representa tion of said electro-magnetic wave trains.

The transmitter comprises a plurality of oscillators A, B, C, and means for energizing the same, as hereinafter described. The receiver is shown at D, and may be of a type already in use, or any mechanical equivalent therefor.

The transmitting antennae are provided with aerialcapacities 4, 5, 6, spark terminals 7, 8, 9, and ground connections 10, 11, 12,

these parts per 86 being of ordinary construction. The receiver D comprises the aerial capacity 13, antenna 14, coherer 15, oranalogous Wave detector, :ground connection 16, inductance coil 17, battery 18, and telephonic receiver 19.

The space 20, between the transmitting and receiving apparatus, represents a great distance. I I

The transmitting antennae 1, 2, 3, are energized by transformers, the secondary windings of which are shown atf21, 22, 23,

and connected as shown. The primary windings are shown at 21, 25, 26, and may be of ordinary construction, but are connected in series. I

The ground wire 27 is connected with a direct current dynamo 28,*from which the wire 29 leads to the key 30, and thence a wire 31 leads to an interrupter 32, which is connected with the primary winding 24. The primary windings 24, 25, 26, are connected by wires 33, 34:, in series with adjustable impedance coils 35, 36, the coil 26 being grounded by a Wire 37.

The oscillators A, B, C, are preferably arranged a little out of alinement with the receiving station, as indicated in Fig. 2. They are spaced far apart, so that the cur rents set up in one antenna have little or no deleterious effects upon the other antennae, by induction or otherwise.

My purpose in placing the antennae out of alinement with each other with respect to the receiving station is to provide a clear path from each of the antennae to the receiving station. This is desirable inorder to prevent any one of the transmitting antennae from screening another and thus impairing its wave energy.

The apparatus above described embodies one of the simplest forms of my invention, and I do not limit myself to the arrangement shown. Above all, a make and break key is not the only kind of transmitter which may be used, as obviously any other transmitter capable of altering the dectri- Patented Dec. 8, 1914.

cal condition of theseveral primary windings ma beemployed without departing from the spirit of my invention.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent 1. The combination of a plurality of antennae all adapted to throw off waves of a common wave length, said antennae being spaced apart by integral multiples of said wave length, and means for separately impressing said antennae with oscillations, the oscillations thus set up in one antenna being of like phase as the oscillations of another antenna. V

2. The combination of a plurality of grounded antennae spaced-apart by a whole wave length or integral multiple thereof,

' and means for impressing upon said antennae electric oscillations alike in phase as distinguished from opposite in phase.

3. In a terminal apparatus for vwireless communication, the combination of a pluralit .of separate antennae, more than two in number, spaced apart throughout their entire lengthsby a distance approximating a wave length or an integral multiple thereof and grounded separately, and means for so energizing all of said antennae as to virtually add the eifects thereof.

4. In a transmitting apparatus for wireless communication, the combination of a plurality of separate antennae, more than two in number, spaced apart throu bout the entire length thereof andgroun ed separately, and means for so energizing all of said antennae as to virtually. add the separate energies thereof.

5. The combination of a-plurality of an tennae, all having their constants arranged so that said antennae are adapted to throw ofl" waves of a common length, said antennae being grounded separately and spaced apart by an entire wavelength or an integral multiple thereof, and means for separately impressing said antennae with oscillations in like phase, as distinguished -from unlike phase.

6. The combination of a receiving antennae and a plurality of transmitting antennae, more than two in number, spaced apart by an entire wave length or an integral multiplethereof.

7. The combination ofa plurality of grounded antennae, more than two in number, spaced apart by an entire wave length or an integral multiple thereof, and means including a circuit common toall of said antennae for energizing the same in like phase as distinguished from unlike phase.

8. The combination of a plurality of transmitting antennae, more than two in number, spaced apart by an entire wavelength or an integral multiple thereof, means common to all of said antenna 'for energizing them simultaneouslyv in like phase, and a receiving antenna common to all of said transmitting antennae for inter cepting waves thrown off by them.

9. The combination of a lurality of transmitting antenna-., more t an two in number, metallically disconnected from each other, and spaced apart in a given vertical .plane by an entire wave length or an inte- WALTON HARRISON.

Witnesses:

F. W. HANAFORD, W. M. AVERY. 

